I do not advertise on this site, I do not track you on this site, I never have and never will, being on this site is safe and thanks to SSL, also secure.
Cookies are a tiny piece of text that your web browser stores on your computer to help websites track your around that website.
So if you’re doing some sort of online shopping and you’re adding several items to your cart, this cart is stored as a cookie, so basically you don’t have to buy one thing, then another and another and so on, it’s all handled as one item. Same as grocery shopping. It’d be a pain to buy one item at a time.
Google uses these cookies to track you so it can better target adverts towards your interest. These are legitimate uses, there are some sites that will use the data for it’s own gains, and it’s these you need to watch out for.
An HTTP cookie (also called web cookie, Internet cookie, browser cookie, or simply cookie) is a small piece of data sent from a website and stored on the user’s computer by the user’s web browser while the user is browsing. Cookies were designed to be a reliable mechanism for websites to remember stateful information (such as items added in the shopping cart in an online store) or to record the user’s browsing activity (including clicking particular buttons, logging in, or recording which pages were visited in the past). They can also be used to remember arbitrary pieces of information that the user previously entered into form fields such as names, addresses, passwords, and credit card numbers.
Other kinds of cookies perform essential functions in the modern web. Perhaps most importantly, authentication cookies are the most common method used by web servers to know whether the user is logged in or not, and which account they are logged in with. Without such a mechanism, the site would not know whether to send a page containing sensitive information, or require the user to authenticate themselves by logging in. The security of an authentication cookie generally depends on the security of the issuing website and the user’s web browser, and on whether the cookie data is encrypted. Security vulnerabilities may allow a cookie’s data to be read by a hacker, used to gain access to user data, or used to gain access (with the user’s credentials) to the website to which the cookie belongs (see cross-site scripting and cross-site request forgery for examples).
The tracking cookies, and especially third-party tracking cookies, are commonly used as ways to compile long-term records of individuals’ browsing histories – a potential privacy concern that prompted European and U.S. lawmakers to take action in 2011. European law requires that all websites targeting European Union member states gain “informed consent” from users before storing non-essential cookies on their device.
Google project zero researcher Jann Horn describes ways cookies can be read by intermediaries, like Wi-Fi hostspot providers. He recommends to use the browser in incognito mode in such circumstances.